Patent Grant
12081856
The present disclosure relates generally to the field of digital cameras. More particularly, the present disclosure relates to digital cameras with pop-out assemblies.
Camera modules of smartphones and tablet computers typically need to have a low thickness—be slim—in order to fit into the casing of these devices. A measure of “slimness” is generally referred to in the art by the term “total-track-length” or TTL. The TTL is generally defined by a distance from an outermost lens to an image sensor of camera module as shown in
Enhancing the performance of a camera may involve, inter alia, enlarging dimensions of the image sensor. Benefits of larger image sensors include improved low-light performance, better resolution, and higher color fidelity. However, enlarging the dimensions of the image sensor requires increasing the TTL of the module to keep a similar Field of View (FOV). Indeed, for a rectangular image sensor having a diagonal length S, the size of the image sensor, the field-of-view (FOV) and an effective focal length (EFL) are linked by the following relation as illustrated in
Therefore, in order to not reduce the FOV, increasing a diagonal length S of the image sensor requires increasing the EFL. Since EFL<TTL, increasing the EFL implies increasing the TTL. The need to increase the TTL conflicts with the aforementioned requirement for low thickness and represents a technical challenge. Standard techniques to address this challenge involve a camera module with a pop-out assembly configured to switch a camera module between a collapsed state—in which the camera module is inactive—and an extended state—in which the camera is active. An example of such technique is for example disclosed in co-owned International Patent Publication WO2021/059097. This pop-out technique enables to increase the TTL only when the camera is in use and to reduce the TTL when the camera is not in use. It is observed that the slimness is required only when the camera is inactive e.g., when a smartphone is in a pocket. Thus, making the module extendible and collapsible on request bridges the conflicting requirements.
In accordance with a first aspect of the presently disclosed subject matter, there is provided a camera module for use in a portable electronic device, the camera module comprising: a lens barrel comprising an objective assembly holding coaxially one or more lens elements defining an optical axis, the lens barrel being configured to axially move between an operative state and a collapsed state; a cover window arranged over the lens barrel and configured to be axially movable between a retracted position and an extended position; an actuator including a driving motor; a cover window pop-out assembly actuatable by the actuator, the pop-out assembly including a driving cam configured to be driven rotationally by the driving motor, the driving cam being coupled to the cover window so that a rotation of the driving cam causes the cover window to axially move between the retracted position and the extended position; a carrier configured to receive the lens barrel (optionally concentrically); a barrel pop-out assembly configured to cause the lens barrel to axially move from the collapsed state to the operative state; and an image sensor configured to image a field of view of the objective assembly when the lens barrel is in the operative state.
Unless stated otherwise, all actuators mentioned in this description are pop-out actuators operative to pop-out a camera lens, lens barrel or another camera part.
In addition to the above features, a camera module according to this aspect of the presently disclosed subject matter can optionally comprise one or more of features (i) to (xlv) below, in any technically possible combination or permutation:
In accordance with another aspect of the presently disclosed subject matter, there is provided a camera module comprising a lens barrel comprising an objective assembly holding coaxially one or more lens elements defining an optical axis, the lens barrel having an operative state and a collapsed state; a carrier configured to receive the lens barrel, the lens barrel being axially movable relative to the carrier; a magnetic spring assembly comprising: at least one permanent magnet fixed to the lens barrel; a ferromagnetic yoke fixed to the carrier, wherein the magnetic spring is configured to cause the lens barrel to axially move relative to the carrier from the collapsed state towards the operative state; and an image sensor configured to image a field of view of the objective assembly when the lens barrel is in the operative state.
In addition to the above features, the camera module according to this aspect of the presently disclosed subject matter can optionally comprise one or more of features (i) to (xxiii) below and respective sub-features, in any technically possible combination or permutation:
In accordance with another aspect of the presently disclosed subject matter, there is provided an optical image stabilization (OIS) system for use in a camera module for allowing movement of a lens barrel in a plane parallel to an image sensor of the camera module, the OIS system forming a layered structure comprising: a bottom frame configured to be mounted on a circuit board, an intermediate frame mounted on the bottom frame and axially coupled thereto so as to be axially shiftable relative to the bottom frame in a first axial direction parallel to a PCB plane; a top frame configured to be fixedly coupled to a carrier of the camera module, the top frame being mounted on the intermediate frame and axially coupled thereto so as to be axially shiftable relative to the intermediate frame in a second axial direction transverse to the first axial direction and parallel to the PCB plane; and a first and second induction motors configured to controllably drive axial movement of the intermediate frame in the first axial direction and of the top frame in the second axial direction.
In accordance with another aspect of the presently disclosed subject matter, there is provided a camera module comprising a lens barrel comprising an objective assembly holding coaxially one or more lens element defining an optical axis, the lens barrel being configured to axially move between an operative state and a collapsed state; a carrier configured to concentrically receive the lens barrel, the lens barrel being axially movable relative to the carrier; an image sensor configured to image a field of view of the objective assembly when the lens barrel is in the operative state; an AF module comprising a induction motor producing linear motion positioned in a radial interstice between the carrier and the lens barrel and configured to cause axial movement of the lens barrel relative to the carrier to enable auto-focus capability when the lens barrel is in the operative state; an OIS system for allowing movement of the lens barrel in a plane parallel to the image sensor the OIS system forming a layered structure comprising: a bottom frame configured to be fixed relative to the image sensor, an intermediate frame mounted on the bottom frame and axially coupled thereto so as to be axially shiftable relative to the bottom frame in a first axial direction parallel to the image sensor; a top frame fixedly coupled to the carrier, the top frame being mounted on the intermediate frame and axially coupled thereto so as to be axially shiftable relative to the intermediate frame in a second axial direction transverse to the first axial direction and parallel to the PCB plane; a first and second OIS induction motors configured to controllably drive axial movement of the intermediate frame in the first axial direction and of the top frame in the second axial direction.
In addition to the above features, the camera module according to this aspect of the presently disclosed subject matter can optionally comprise one or more of features (i) to (xiii) below and respective sub-features, in any technically possible combination or permutation:
In accordance with another aspect of the presently disclosed subject matter, there is provided an electronic portable device comprising a camera module according to any of the preceding aspects.
In accordance with another aspect of the presently disclosed subject matter, there is provided a camera module for use in a portable electronic device, camera module comprising: a lens barrel comprising an objective assembly holding coaxially one or more lens elements defining an optical axis, the lens barrel being configured to be axially movable between an operative state and a collapsed state; an actuator including a driving motor; a cover window pop-out assembly actuatable by the actuator, the pop-out assembly including a driving cam configured to be driven rotationally by the driving motor, the driving cam being coupled to the cover window so that a rotation of the driving cam causes the cover window to axially move between the retracted position and the extended position; a carrier configured to receive the lens barrel concentrically; the window pop-out assembly configured to push the lens barrel to axially move from the collapsed state to the operative state, so that a height of the window pop-out assembly is defined; and an image sensor configured to image a field of view of the objective assembly when the lens barrel is in the operative state. Additionally, in the pop-out state the window pop-out assembly may not be in contact with the lens barrel.
In the present disclosure, the following terms and their derivatives may be understood according to the below explanations:
The term “Total Track Length” (TTL) may refer to the maximal distance measured along an axis parallel to the optical axis of the camera module, between a point of a front surface of a most distal lens element and an image sensor of the camera module, when the camera module is at infinity focus. The height of the camera module may be greater than the TTL as it may generally include additionally a back housing and a cover window.
The term “horizontal plane”, “XY plane” or “sensor plane” may refer to a plane which is parallel to an image sensor of the camera module. The term “vertical” may refer to the direction which is perpendicular to the horizontal sensor plane. An optical axis of the camera module may extend parallel to the vertical axis and may by extension be referred to as the Z-axis.
The terms “above/below”, “upper/lower”, “top/bottom” may refer to differences in Z-coordinates. The terms “height” and “depth” refer to vertical distances (in the Z-direction), while “width” and “length” refer to horizontal distances (in either the X-direction or the Y-direction). Terms such as “vertical” or “horizontal” do not imply anything about the orientation of the camera module when the camera module is in use. The camera module may be oriented in any suitable direction during usage or manufacturing, for example sideways.
The terms “inner” and “outer” and their derivatives such as “inward” and “outward” may be defined with reference to an optical axis of the camera module, wherein an element which is closer to the optical axis than another element is referred to as inner while referred to as outer if it is farther. Similarly, an inner surface or wall of an element is defined as a surface closer to the optical axis than an outer surface of the same element.
The terms “proximal” and “distal” may be used to refer to a relative proximity to the image sensor along the Z axis. An element may be referred to as distal if it is further away from the sensor than another element which can then be referred to as proximal.
The term “coupling” may refer to a mechanical connection between two (or more) elements enabling transmission of movement from one element to another element. The term coupling may encompass direct connection (abutment) between elements of indirect connection (linkage). For example, an axial coupling may refer to a mechanical connection allowing two elements to axially move relative to each other. A fixed coupling between two elements may refer to a connection such that any movement of one element is transmitted into a same movement of the other element e.g. the two elements are attached to each other.
In order to better understand the subject matter that is disclosed herein and to exemplify how it may be carried out in practice, embodiments will now be described, by way of non-limiting example only, with reference to the accompanying drawings, in which:
Camera module 100 comprises a lens barrel 120, a carrier 130 configured to receive coaxially lens barrel 120 and an image sensor 160. Lens barrel 120 comprises an objective assembly holding coaxially one or more lens elements 125 defining an optical axis Z of the camera module. Camera module 100 further comprises a retractable cover window 150. Carrier 130 may be configured to form a sleeve around lens barrel 120. Cover window 150 may generally include a protective surface having an aperture, preferably centrally located on the protective surface. The aperture may be closed by a sealing element allowing light to pass therethrough. The protective surface of cover window 150 may be exposed to an outside environment i.e. be the most distal element of camera module 100 from image sensor 160. Cover window 150 may be configured to be axially movable between a retracted position and an extended position corresponding respectively to a proximal axial position and a distal axial position of the cover window relative to image sensor 160. Lens barrel 120 also has an operative state and a collapsed state corresponding respectively to a proximal axial position and a distal axial position of the lens barrel relative to image sensor 160. In the operative state of the lens barrel, image sensor 160 may be positioned in a focal plane or in an imaging plane of the objective assembly. In an active mode of the camera module, cover window 150 may be in the extended position and lens barrel 120 may be in the operative state while in an inactive mode of the camera module, cover window 150 may be in a retracted position the lens barrel 120 may be in a collapsed state. The motion of cover window 150 and lens barrel 120 between the retracted/extended positions and collapsed/operative state may be coordinated to allow camera module 100 to selectively be operated in the active or inactive mode. Camera module 100 may include a coordinating mechanism/controller for coordinating the motion of the cover window and lens barrel. In the inactive mode, the camera module may be disabled i.e. the camera module may be unable to image a field of view of the objective assembly. The active mode corresponds to a pop-out state of camera module 100 in which a TTL of the camera module (and a module height) is higher than the TTL of the camera module (and the module height) in the collapsed state (also referred to as cTTL).
In the retracted position, cover window 150 may be positioned in close proximity to a most distal surface of lens barrel 120 in the collapsed state. In some embodiments, cover window 120 in the retracted position may abut on the most distal surface (e.g. a rim) of lens barrel 120 in the collapsed state. In the extended position, cover window 150 may be positioned to provide for an axial gap with lens barrel 120 in the operative state. A difference in height of camera module 100, between the extended state and the collapsed state may be larger than 10%, larger than 20%, or larger than 30% of the height of the camera module in the collapsed state. Camera module 100 may further include a cover window pop-out assembly 110 configured to controllably move axially cover window 150 between the retracted position and the extended position. Cover window pop-out assembly 110 may be configured for reversibly move the cover window between the retracted position and the extended position i.e. to move the cover window from the retracted position to the extended position and vice versa from the extended position to the retracted position.
Camera module 100 may further include a barrel pop-out assembly 111 (shown with dashed lines in
Camera module 100 further includes an actuator 140 having a driving motor configured for operating cover window pop-out assembly 110. In embodiments having a separate lens barrel pop-out assembly 111, an actuator 140 of the cover window pop-out assembly may act as an actuator of lens barrel pop-out assembly. In some embodiments, the barrel pop-out assembly may be actuated independently of an actuation of the window pop-out assembly.
Cover window pop-out assembly 110 may include a driving cam (not shown) configured to be driven rotationally by actuator 140.
Cover window 150 may be coupled to the driving cam so that a rotation in a first rotational direction of the driving cam may cause cover window 150 to axially move from the retracted position to the extended position. A rotation in a second opposite rotational direction of the driving cam may cause cover window 150 to axially move from the retracted position to the extended position. The rotation of the driving cam may be about a rotation axis parallel to the Z-axis. In comparison to an axial driving cam of the prior art, the rotary drive cam implementation notably provides an improved use of the available space for the camera module. Camera module 100 may comprise a housing (not shown) configured to receive cover window pop-out assembly 110. Retractable cover window 150 may be arranged axially movable relative to the housing. The driving cam may be rotationally coupled to the housing via one or more bearing balls enclosed in one or more corresponding arcuate or circular grooves formed in the housing. The coupling using bearing balls in arcuate/peripheral grooves may provide a smooth and accurate motion without clearance and minimum friction. In some embodiments, the driving cam may be axially sandwiched between a back housing and a front housing and the coupling of the driving cam to the housing may comprise a lower and upper coupling each comprising one or more bearing balls enclosed in one or more corresponding arcuate or circular grooves formed respectively in the back and front housing.
In some embodiments, the objective assembly may include four or more lenses in the lens barrel. In some embodiments, the objective assembly may further include one or more static lenses disposed outside of lens barrel 120. The one or more static lenses elements may be configured to be static relative to the housing of camera module 100.
Camera module 100 may further comprise an auto-focus (AF) module (not shown). In some embodiments, the AF module may be configured to move lens barrel 120 along the optical axis Z when lens barrel 120 is in the operative state. In these embodiments, cover window 150 may be configured so that it provides in the extended position an axial gap with the lens barrel in the operative state. Further, lens barrel 120 may include a lens element having a D-cut shape as shown for example on
Camera module 100 may further include an OIS system (not shown) configured to compensate for motion of the camera module during imaging. In some embodiments, the OIS system may be configured to move lens barrel 120 in a horizontal plane along two transverse axes such as the X and Y axes. The OIS system may be configured according to the third aspect of the present disclosure described in more details herein below. The OIS system may include a bottom frame configured to be fixed relative to sensor 160, an intermediate frame configured to move in one transverse direction (e.g. the X direction) relative to the bottom frame and a top frame configured to move in the other transverse direction (e.g. the Y direction) relative to the intermediate frame. Carrier 130 may be mounted on the top frame and the intermediate and top frames may be controllably driven along the X and Y axes using VCMs (or more generally induction motors producing linear motion). This may enable the height of the OIS system to be less than 15%, less than 25%, less than 30% or less than 50% of the height of camera module in the collapsed state. In some other embodiments, the OIS system may be a sensor based OIS system configured to move the sensor 160 in the sensor plane along two transverse axes such as the X and Y axes. The OIS system may additionally or alternatively be configured to move the sensor for rotating the sensor along a yaw, a pitch and/or a roll rotation axes. The OIS system may include an OIS controller configured to operate the OIS.
Generally, camera module 100 may be configured to be waterproof. Camera module 100 may include a protective seal configured to maintain impermeability of the camera module in the collapsed state and in the operative state as well as in intermediate states of camera module 100. Camera module 100 may also allow dust resistance and be configured to meet the Ingress Protection code IP68 standards.
Camera module 100 may also include an optical filter configured for filtering out a predetermined portion of the electromagnetic spectrum detectable by the image sensor. This may enable to filter non-visible radiations such as infrared radiations.
Generally, dimensions of camera module 100 may be in the following ranges: the camera module including the actuator may fit in a circle having a diameter between 6 and 50 mm. A diameter of the cover window may be between 5 and 40 mm. A height of the camera module in the inactive (collapsed) mode may be between 6 and 18 mm while in the active (pop-out) mode it may be between 7 and 30 mm. A variation of height between the inactive and active mode of the camera module may be between 1 and 15 mm.
Camera module 200 further includes a cover window pop-out assembly configured to controllably move cover window pop-out assembly 210 configured to controllably move axially cover window 250 between the retracted position and the extended position. The cover window pop-out assembly may be configured for reversibly move the cover window between the retracted position and the extended position i.e. to move the cover window from the retracted position to the extended position and vice versa from the extended position to the retracted position.
The objective assembly may further include a static lens 280 disposed outside of lens barrel 220. The cover window pop-out assembly may be configured to control an air gap between static lens 280 and lens barrel 220. The cover window pop-out assembly comprises a driving cam 210 (see for example
Camera module 200 may also comprise a back housing 265 (see for example
With continuing reference to
Further, driving cam 210 may include a cam barrel 213 and a cam flange 214 at a base thereof. Cam flange 214 may comprise three radial sections protruding outwardly of the base of cam barrel 213. Driving cam 210 may further include a radial position sensor 255. Driving cam 210 may be coaxially positioned relative to the optical axis outwardly of carrier 230. Driving cam 210 may be axially sandwiched between back housing 265 and a front housing 270. Front housing 270 may form a locking ring fixed to back housing 265 for maintaining the driving cam onto back housing 265. Driving cam 210 may respectively be coupled to the front and back housing via ball bearing couplings 271, 272 so that lens barrel 230 can rotate relative to front and back housing 265, 270. Ball bearing couplings 271, 272 may comprise a plurality of bearing balls and arcuate or peripheral grooves for receiving the bearing balls. The bearing balls may provide for a low friction bearing and provide for accurate motorized control ability. Furthermore, driving cam 210 may be friction coupled to worm wheel 247 so that a rotation of worm wheel 247 is generally transmitted to driving cam 210. The friction coupling between driving 210 cam and worm wheel 247 may be configured to be overcome when a collapsing force larger than a predefined threshold is applied on the carrier. In other words, the friction contact between driving cam 210 and worm wheel 247 may be configured to allow sliding beyond a predefined torque between worm wheel 247 and driving cam 210. This may provide a protection mechanism in case an excessive torque is applied between driving cam 210 and worm wheel 247.
Carrier 230 may comprise a carrier barrel 233 coaxially positioned inwardly of cam barrel 213. Carrier barrel 233 and cam barrel 213 may be coupled to form a helical cam so that a rotational motion of cam barrel 213 is transformed into an axial motion of carrier barrel 233. More particularly, the coupling between carrier barrel 233 and driving cam barrel 213 may comprise one or more (e.g. three) helical grooves 215 on an inner wall of cam barrel 213 configured to cooperate with corresponding one or more (e.g. three) helical grooves 235 on an outer wall of carrier barrel 233 so as to enclose corresponding one or more (e.g. three) bearing balls 237 capable of transferring movement from cam barrel 213 to carrier barrel 233. The helical grooves on the inner wall of the cam barrel and the helical grooves on the outer wall of the carrier barrel may have a different inclination relative to the optical axis. Furthermore, carrier 230 and back housing 265 may be coupled using an axial coupling. The axial coupling between carrier 230 and back housing 265 may comprise one or more (e.g. three) axial grooves 236 on an inner wall of carrier barrel 233 configured to cooperate with one or more (e.g. three) corresponding axial grooves 266 on an outer wall of a central barrel 269 of back housing 265. Central barrel 269 may be positioned coaxially inwardly of carrier barrel 233. Carrier barrel 233 may be radially sandwiched between cam barrel 213 and central barrel 269. The axial coupling between carrier 230 and back housing 265 may further comprise one or more (e.g. three) alignment bearing balls 267 enclosed by axial grooves 236, 266 respectively in carrier 230 and back housing 265, the bearing balls being capable of maintaining a concentricity of carrier 230 relative to back housing 265. Optionally, one of the axial grooves 239 in the carrier 230 may be flexible (i.e. is made of a material having a flexibility higher than the flexibility of the carrier material) to allow for lateral preloading. This may enable to ensure a smooth, accurate and repeatable motion of carrier 230.
In operation, the pop-out assembly may operate according to the following transmission chain: (1) motor 245 (rotary motor) coupled to worm screw 246 rotates worm wheel 247, (2) worm wheel 247 rotates driving cam 210 (helix cam) by friction contact, (3) the driving cam creates a linear up/down motion of carrier 230 by an helical coupling (two helixes formed by helical grooves 215, helical grooves 235 and bearing balls 237), (4) carrier 230 (linear slide) is guided by preloaded linear bearing implemented by the axial coupling between carrier 230 and back housing 265. The linear up/down motion of carrier 230 is transmitted to lens barrel 220 and to the cover window as they are fixedly coupled thereto.
Camera module 200 may further comprise an emergency mechanism configured to protect the helical cam mechanism in case an excessive force is applied on the carrier while the camera module is in an active mode. This may provide a drop event protection for avoiding mechanism and camera damage in case of a drop event. The emergency mechanism may comprise one or more (e.g. three) emergency pins 238 projecting radially outwardly from the outer wall of carrier barrel 233 and cooperating with one or more (e.g. three) corresponding emergency helical grooves 216 in cam barrel 213 such that emergency pins 238 engage the emergency helical grooves only when a collapsing force larger than a predefined threshold is applied axially on carrier 230 when in the operative state. The emergency pins may provide for a larger contact area in case excessive collapsing force is applied on carrier 230.
Camera module 200 may further include a protective seal 285 (see for example
Camera module 200 may further comprise one or more preloaded compression springs 268 configured to axially bias carrier 230 to prevent backlash. The one or more springs 268 may be positioned between a flange of back housing 265 and a flange of carrier 230. When one spring is provided, spring 268 may be positioned concentrically inwardly to central barrel 269 and outwardly to lens barrel 220. In some embodiments, more than one (e.g. three) springs are provided distributed (e.g. at 120 degrees) around the optical axis from each other. The more than one springs may be positioned inwardly to central barrel 269 and outwardly to lens barrel 220. The spring(s) may be compressed also in the operative state of carrier 230. Camera module 200 may further comprise an AF module (not shown). The AF module may be configured to move sensor 260 along the optical axis Z to provide auto-focus capability when the camera module is in operative mode. In other embodiments, the AF module may be configured to move the lens barrel along the optical axis Z to perform auto-focus. Camera module 200 may also include an OIS system to provide stabilization capability. The OIS system may be configured to move sensor 260 in the sensor plane along the X and Y axes. The OIS system may additionally or alternatively be configured to move the sensor for rotating the sensor along a yaw, a pitch and/or a roll rotation axes.
Generally, dimensions of camera module 200 may be in the following ranges: the camera module including the actuator may fit in a circle having a diameter between 6 and 50 mm. A diameter of the cover window may be between 5 and 40 mm. A height of the camera module in the inactive (collapsed) mode may be between 6 and 18 mm while in the active (pop-out) mode it may be between 7 and 30 mm. A variation of height between the inactive and active mode of the camera module may be between 1 and 15 mm.
Camera module 300 comprises a lens barrel (not shown) and a carrier 330, a retractable cover window 350 and an image sensor 360. The lens barrel comprises an objective assembly. The objective assembly may hold coaxially a plurality of lens elements defining an optical axis Z of the camera module perpendicular to the plane of image sensor 360. Carrier 330 may accommodate coaxially the lens barrel. Lens barrel 220 may be slidably received in carrier 330 i.e. be able to move axially relative thereto. In other embodiments, the lens barrel can be fixedly mounted in carrier 330 for example by being glued in carrier 330 by active alignment process. Cover window 350 has an extended position (see
Camera module 300 further includes a cover window pop-out assembly configured to controllably move cover window 350 between the retracted position and the extended position. The pop-out assembly comprises a driving cam 310 cooperating with carrier 330 via a coupling mechanism described in more details below. Cover window 350 may be fixedly coupled to carrier 330 so that a movement of carrier 330 is transmitted to cover window 350. The cover window pop-out assembly is operated by an actuator 340. Carrier 330 is coupled to the driving cam so that a rotation in a first rotational direction of driving cam 310 causes an upward vertical movement of carrier 330 and consequently causes the cover window to axially move from the retracted position to the extended position. A rotation in a second opposite rotational direction of driving cam 310 causes a downward vertical movement of carrier 330 and consequently causes the cover window to axially move from the extended position to the retracted position.
Camera module 300 may also comprise a back housing 365 configured to receive the pop-out assembly and carrier 330. Retractable cover window 350 may be arranged axially movable relative to back housing 365. In the retracted position, cover window 350 may be arranged over the carrier and positioned in close axial proximity to a most distal surface of the lens barrel. As explained in more details below, driving cam 310 is configured to controllably move retractable cover window 350 together with carrier 330.
Actuator 340 may comprise a motor 345 and a worm drive comprising a worm screw 346 and a worm wheel. The worm wheel may form a ring including a protruding section 348 geared to the worm screw. In the present embodiments, the worm wheel may be integral to driving cam 310. The driving cam may include a cam barrel 313 and a flange at a base thereof. Protruding section 348 may radially protrude from the flange. Motor 345 may be configured to rotate the worm screw along its longitudinal axis. The worm screw may be configured to cause driving cam 310 to rotate around the Z axis when it is rotated via the geared protruding section 348. Motor 345 may be a stepper motor. For switching the camera module from an active mode (also referred to as pop-out state), motor 345 may actuate driving cam 310 in the second rotational direction via the worm screw. For switching the camera module from the inactive mode to the active mode, motor 345 may actuate driving cam 310 in the first rotational direction opposite to the second rotational direction via the worm screw. Actuator 340 may further include a preload spring 349 configured for ensuring that worm screw 346 and the worm wheel via protruding section 348 stay in direct contact. Further, preload spring 349 may act as a shock absorber or drop absorber in case an external force above a predetermined threshold prone to collapse camera module 300 is applied thereto while in the operative state. The external force may be directed co-linear to the pop-out module movement for collapsing the camera. The predetermined threshold may define a force that is significantly stronger than forces applied by stepper motor 345 for popping out and collapsing the carrier, lens barrel and window cover. For example, such external force may result from a user dropping the electronic portable including a pop-out camera that includes camera module 300. For example, the force may be about 5N or more.
When the external force is applied to pop-out module 300, preload spring 349 is configured to expand. As a result of spring 349 expansion, worm wheel protruding 348 may disengage from worm screw 346, i.e. a distance between worm wheel protruding section 348 and worm 346 increases, and, at some point, the teeth of worm wheel protruding section 348 are not in contact with the teeth of worm screw 346 anymore. This is beneficial as the external force is not applied to any of the components included in pop-out actuator 340, e.g. to stepper motor 345. When the external force stops, preload spring 349 contracts, so that worm wheel protruding section 348 re-engages with worm screw 346, i.e. the teeth of worm wheel protruding section 348 return to contact with the teeth of worm screw 346.
Back housing 365 may comprise a central barrel 369 (see
Camera module 300 may include a barrel pop-out assembly configured to cause the lens barrel to axially move from the collapsed state to the operative state. The barrel pop-out assembly may be further configured to cause the lens barrel to axially move from the operative state to the collapsed state. In some embodiments, the barrel pop-out assembly may include a magnetic spring as described herein below. In some other embodiments, the barrel pop-out assembly may include an induction motor producing linear motion. For example, the barrel pop-out assembly may include a permanent magnet fixed to an outer wall of the lens barrel and an electrical coil fixed to an inner wall of the carrier. The magnet and electrical coil may be configured so that a current in the electrical coil is capable of inducing axial forces on the permanent magnet to bring the lens barrel from the collapsed state to the operative state at least when the cover window pop moves from the retracted position into the extended position. Further, the magnet and electrical coil may be configured so that a current in the electrical coil is capable of inducing axial forces on the permanent magnet to bring the lens barrel from the operative state into the collapsed state at least when the cover window moves from the extended position into the retracted position. In other embodiment, the cover window 350 may be configured to push the lens barrel into the collapsing state when the lens barrel is in the operative state and cover window 350 is operated by the cover window pop-out assembly to move from the extended position to the retracted position.
Camera module 300 may further comprise an AF module (not shown) configured to move the lens barrel along the optical axis Z when the lens barrel is in the operative state. The AF module may include an electrical coil and a permanent magnet (or generally a VCM, or more generally an induction motor producing linear motion) as described above, further configured to be capable of inducing axial forces to perform auto-focus when the lens barrel is in the operative state. In some other embodiments, the AF module may be configured to move sensor 360 along the optical axis Z.
Camera module 300 may further include an optical image stabilization system (OIS, not shown. In some embodiments, the OIS system may be configured to move lens barrel 120 in a horizontal plane along two transverse axes such as the X and Y axes. The OIS system may be configured according to the third aspect of the present disclosure described in more details herein below. In some embodiments, the OIS system may be configured to move sensor 360 in the sensor plane along two transverse axes such as the X and Y axes. The OIS system may additionally or alternatively be configured to move the sensor for rotating the sensor along a yaw, a pitch and/or a roll rotation axes. Camera module 300 may be configured to be waterproof. The camera module may include a protective seal configured to maintain impermeability of the camera module in the collapsed state and in the operative state as well as in intermediate states of camera module 300. Camera module 300 may also allow dust resistance and be configured to meet the Ingress Protection code IP68 standards. Camera module 300 may also include an optical filter configured for filtering out a predetermined portion of the electromagnetic spectrum detectable by the image sensor. This may enable to filter non-visible radiations such as infrared radiations.
Generally, dimensions of camera module 300 may be in the following ranges: the camera module including the actuator may fit in a circle having a diameter between 6 and 50 mm. A diameter of the cover window may be between 5 and 40 mm. A height of the camera module in the inactive (collapsed) mode may be between 6 and 18 mm while in the active (pop-out) mode it may be between 7 and 30 mm. A variation of height between the inactive and active mode of the camera module may be between 1 and 15 mm.
Pop-out module 400 may include a lens carrier (not shown), a barrel (not shown), a cover window (not shown) and a back housing (not shown). Pop-out actuator 440 may include a worm screw 446, a gear 450, a worm wheel 447, a stepper motor 445 and a motor housing 443. The worm wheel may include a gearing 448 configured to cooperate with the gear 450. For switching a pop-out camera including pop-out module 400 from an active mode to an inactive mode and from an inactive mode to an active mode, stepper motor 445 actuates worm screw 446 respectively in a first rotation direction and in a second rotation direction opposite to the first direction. Gear 450 and worm wheel 447 transmit the worm screw's rotation into a circular movement of a driving cam 410, which is in turn translated into a linear motion of window rail 410 parallel or anti-parallel to a vertical direction indicated by a Z axis in a manner similar to the above description of camera module 300. In addition, pop-out actuator 440 includes a spring 449 that acts as a drop absorber. Pop-out module 400 including driving cam 410 and three angled grooves switches the pop-out camera from pop-out to collapsed state and vice versa.
When an external force above a predetermined threshold is applied prone to collapse camera module 400 is applied thereto while in the operative state, spring 449 may act as a shock absorber. The external force may be directed colinear to the pop-out module movement for collapsing the camera. The predetermined threshold may define a force that is significantly stronger than forces applied by stepper motor 445 for popping out and collapsing the carrier, lens barrel and window cover. For example, such external force may result from a user dropping the electronic portable including a pop-out camera that includes camera module 400. For example, the force may be about 5N or more. With reference to
Camera module 500 comprises a lens barrel 520, a carrier 530 configured to receive the lens barrel 520 and an image sensor 560. Camera module 500 further includes a cover window 550. Lens barrel 520 may comprise an objective assembly. The objective assembly may hold coaxially a plurality (e.g. four) lens elements (not shown) defining an optical axis Z of camera module 500. Carrier 530 may include a carrier barrel including one or more peripheral shoulder recesses in an inner wall thereof. The shoulder recesses may be configured for supporting one or more peripheral flange protrusions (hooks) radially protruding outwardly of lens barrel 520. The one or more peripheral shoulder recesses and corresponding one or more peripheral flange protrusions may form a stopper configured to limit an axial motion of lens barrel 520 relative to the carrier barrel in the sensor direction (i.e. downward).
The cover window 550 may be configured to be axially movable between a retracted position and an extended position corresponding respectively to a proximal axial position and a distal axial position of the cover window relative to image sensor 560. Lens barrel 520 may also have an operative state and a collapsed state corresponding respectively to a proximal axial position and a distal axial position of the lens barrel relative to image sensor 560. In the operative state of the lens barrel, image sensor 560 may be positioned in a focal plane or in an imaging plane of the objective assembly. In an active mode of the camera module, cover window 550 may be in the extended position and lens barrel 520 may be in the operative state while in an inactive mode of the camera module, cover window 550 may be in a retracted position and lens barrel 520 may be in a collapsed state. Lens barrel 520 may be positioned coaxially inwardly to carrier 530. In the operative state, image sensor 560 is positioned in a focal plane or in an image plane of the objective assembly. In the collapsed state, the camera module may be disabled i.e. the camera module may be unable to image a field of view of the objective assembly. The operative state of the lens barrel corresponds to a pop-out (active) mode of camera module 500 in which a TTL of the camera module is higher than a TTL of the camera module in the inactive mode.
Camera module 500 may include a barrel pop-out assembly configured to cause the lens barrel to axially move from the collapsed state to the operative state. The barrel pop-out assembly may be further configured to cause the lens barrel to axially move from the operative state to the collapsed state.
Camera module 500 may further include a cover window pop-out assembly configured to controllably move axially cover window 550 between the retracted position and the extended position. The cover window pop-out assembly may be configured for reversibly move the cover window between the retracted position and the extended position i.e. to move the cover window from the retracted position to the extended position and vice versa from the extended position to the retracted position. The cover window pop-out assembly comprises a driving cam 510 cooperating with carrier 530 via a coupling mechanism described in more details below. Carrier 530 is coupled to the driving cam so that a rotation in a first rotational direction of the driving cam causes cover window 550 to axially move from the retracted position to the extended position. A rotation in a second opposite rotational direction of the driving cam causes cover window 550 to axially move from the extended position to the retracted position. Cover window 550 may be configured to push lens barrel 520 into the collapsing state when lens barrel 520 is in the operative state and cover window 550 is operated by the cover window pop-out assembly to move from the extended position to the retracted position.
In the retracted position, cover window 550 may be positioned in close proximity to a most distal surface of lens barrel 520 in the collapsed state. Cover window 550 in the retracted position may abut on a most distal surface of lens barrel 520 in the collapsed state. In the extended position, cover window 550 may be configured to provide an axial gap with respect to the most distal surface of lens barrel 520. As explained in more details below, the barrel pop-out assembly may be configured to controllably move lens barrel 520 while carrier 530 is axially moved. Camera module 500 may also comprise a back housing 565 configured to receive the pop-out assembly and carrier 530. Retractable cover window 550 may be arranged axially movable relative to back housing 565.
The actuator 540 may comprise a motor 545 and a worm drive comprising a worm screw and a worm wheel as described above with reference to
Carrier barrel 530 may be coaxially positioned inwardly of driving cam 510. Carrier 530 may be fixedly coupled to cover window 550 so that an axial movement of the carrier is transmitted to the cover window. Carrier barrel 530 and driving cam 510 may be coupled to form a helical cam so that a rotational motion of the driving cam 510 is transformed into an axial motion of carrier 530. Driving cam 510 may comprise one or more (e.g. three) radial pins 511 engaging carrier 530. Radial pins 511 may protrude inwardly of driving cam 510 into one or more (e.g. three) corresponding helical grooves 531 formed on an outer wall of the carrier barrel. The carrier may comprise one or more (e.g. three) carrier radial pins 532 protruding from an outer wall thereof through at least one corresponding axial groove in a central barrel of back housing 565 to maintain concentricity of carrier 530 relative to back housing 565.
Lens barrel 520 may be coupled to carrier 530 via an axial coupling enabling axial movement of lens barrel 520 relative to carrier 530. The axial coupling between carrier 530 and lens barrel 520 may include two axial rails 522a, 522b formed in an interspace between lens barrel 520 and carrier 530 and bearing balls 521 enclosed in the axial rails 522a, 522b (see e.g.
The barrel pop-out assembly may be implemented using the VCM of the AF module. The magnet and electrical coil may further be configured so that a current in the electrical coil induces axial forces on the permanent magnet so as to bring the lens barrel from the collapsed state to the operative state at least when the cover window pop moves from the retracted position into the extended position. The axial movement of the carrier may be transmitted to the electrical coil mounted on the carrier and a current applied in the electrical coil may induce axial forces in the magnet on the barrel so as to axially move the barrel. In other words, the barrel is electromagnetically moved while the carrier is mechanically moved via the driving cam. In other embodiments, the barrel may be moved axially from the collapsed state towards the operative state via a mechanical interaction between the shoulder recesses and flange protrusions when the carrier is axially moved. Alternatively, the shoulder recesses and flange protrusions may be used as a stopper in exceptional circumstances such as power failure or the VCM being out of an auto-focus range. Further, the magnet and electrical coil may be configured so that a current in the electrical coil induces axial forces on the permanent magnet to bring the lens barrel from the operative state into the collapsed state at least when the cover window moves from the extended position into the retracted position.
In some embodiments, at least one of the lens elements in the objective assembly is cut to form a D-cut lens, thereby freeing a D-cut volume as illustrated in
Camera module 500 may further include a protective seal 585 configured to maintain impermeability of camera module 500 in the collapsed state and in the operative state as well as in intermediate states of camera module 500. Protective seal 585 may be configured to allow dust resistance. Protective seal 585 may be configured to meet the Ingress Protection code IP68 standards. Protective seal 585 may be a diaphragm. Protective seal 585 may form a foldable sleeve. One end of the sleeve may be fixed to an outer peripheral edge of carrier 530, and another end of the sleeve may be fixed to an inner peripheral edge of front housing 570.
Camera module 500 may also include an optical image stabilization system to provide stabilization capability. The OIS system may be configured to move sensor 560 in the sensor plane along the X and Y axes. The OIS system may additionally or alternatively be configured to move the sensor by rotating the sensor along a yaw, a pitch and/or a roll rotation axes, preferably along a yaw (Z) and pitch (X) rotation axes.
Generally, dimensions of camera module 500 may be in the following ranges: the camera module including the actuator may fit in a circle having a diameter between 6 and 50 mm. A diameter of the cover window may be between 5 and 40 mm. A height of the camera module in the inactive (collapsed) mode may be between 6 and 18 mm while in the active (pop-out) mode it may be between 7 and 30 mm. A variation of height between the inactive and active mode of the camera module may be between 1 and 15 mm.
Camera module 600 comprises a lens barrel 620, a carrier 630 configured to receive the lens barrel 620 and an image sensor 660. Camera module 600 may further comprise a retractable cover window 650. Lens barrel 620 comprises an objective assembly. The objective assembly may hold coaxially a plurality (e.g. four) lens elements 625 defining an optical axis Z of camera module 600. Carrier 630 may include a carrier barrel for receiving lens barrel 620.
Lens barrel 620 may be positioned coaxially inwardly to carrier 630. Lens barrel 620 may be coupled to carrier 630 to allow axial displacement of lens barrel 620 relative to carrier 630. Lens barrel 620 and carrier 630 may be axially coupled using at least one or more (e.g. two) axial rails and corresponding one or more (e.g. two) bearing balls enclosed therebetween. Carrier 630 may be coupled to be axially fixed relative to image sensor 660 relative to the Z axis. Lens barrel 620 has an operative state and a collapsed state. In the operative state, image sensor 660 is positioned in a focal plane or in an imaging plane of the objective assembly. In the collapsed state, the camera module may be disabled i.e. the camera module may be unable to image a field of view of the objective assembly. The operative state of the lens barrel corresponds to a pop-out (active) mode of camera module 600 in which a TTL of the camera module is higher than a TTL of the camera module in the inactive mode.
Camera module 600 further includes a barrel pop-out assembly configured to controllably move lens barrel 620 from the collapsed state to the operative state. The barrel pop-out assembly comprises a magnetic spring assembly 610 configured to bias lens barrel 620 in the operative state. Magnetic spring assembly 610 comprises at least one permanent magnet 670 fixed to lens barrel 620 and a ferromagnetic yoke 680 fixed to carrier 630. Magnetic spring 610 may be configured to cause lens barrel 620 to axially move relative to carrier 630 from the collapsed state towards the operative state. The magnetic spring assembly may be positioned in an interstice between carrier 630 and lens barrel 620. The at least one permanent magnet 670 may be fixed to an outer wall of lens barrel 620. Yoke 680 may be fixed to an inner wall of the carrier barrel. In other words, the present aspect provides using magnetic forces applied on the yoke by the permanent magnet to produce a vertical biasing force on lens barrel 620 in the manner of a spring.
Retractable cover window 650 may also be configured to controllably move axially between a retracted position and an extended position. In the retracted position, cover window 650 may be positioned to abut on the most distal surface (e.g. a rim) of lens barrel 620 in the collapsed state. In the extended position, cover window 650 may be positioned to provide for an axial gap with the most distal surface of lens barrel 620 in the operative state. The motion of cover window 650 between the retracted and extended positions and motion lens barrel 620 between the collapsed and extended positions may be coordinated. The axial movement of the cover window 650 may be driven by a cover window pop-out assembly 611 operated by an actuator 640. In the retracted position, cover window 650 may be configured to hold lens barrel 620 in the collapsed position. In other words, the cover window in the retracted position may overcome the magnetic force of magnetic spring assembly 610. In the extended position, the cover window may be configured to provide for an axial gap with lens barrel 620 in the operative state. The axial gap may allow some axial movement lens barrel 620 from the operative state thereby allowing auto-focus capability. Window cover 650 may further be configured to cause the lens barrel to move from the operative state to the collapsed state when the cover window is operated to move from the extended position to the retracted position by window cover pop-out assembly 611. In other words, the window cover may push on the lens barrel and collapse lens barrel 620 in the collapsed state when moving from extended position to the retracted position upon operation of window cover pop-out assembly 611. When cover window 650 is moved from the retracted position to the extended position, lens barrel 620 is released and the magnetic force may drive lens barrel 620 towards the operative state. In some embodiments, the cover window pop-out assembly may be any of the cover window pop-out assembly described with reference to
Camera module 600 may further include an AF module comprising at least one electrical coil fixed to an inner wall of the carrier barrel. The electrical coil may be configured so that, when the lens barrel moves towards the operative state into an auto-focus range, a current in the at least one electrical coil is capable of inducing axial forces on the at least one permanent magnet to cause axial movement of the lens barrel and enable auto-focus capability of the camera module. The auto-focus range may refer to positions along the Z axis for which the electrical coil may induce forces capable of axially moving the lens barrel. Magnetic spring assembly 610 may be configured to move the lens barrel within the auto-focus range. In some embodiments, the AF module may allow maintaining lens barrel 620 in the operative state. In some embodiments, the pop-out force may allow maintaining the barrel 620 in the operative state. As can be understood, the pop-out force may be significantly smaller in the operative state than in the collapsed state. The magnetic spring may be relaxed in the operative state and the small pop-out force may then be overcome by the interaction of the auto-focus electrical coil and the permanent magnet in order to focus the camera. The AF module may further include a driving circuitry configured to operate the AF module and a optionally position sensor (not shown) to determine a vertical position of lens barrel 620. The AF module may further comprise a PCB which may be fixed to the inner wall of the carrier. The driving circuitry and the electrical coil may be mounted on the PCB. Camera module 600 may further comprise a current supply wiring for supplying current to the AF module. The current supply wiring may extend from a main PCB onto which sensor 660 may be mounted to the PCB onto which the at least one electrical coil is mounted.
Lens barrel 620 may include one or more lens elements having at least one D-cut shape. For example, 10% to 50% of the optical height of any D-cut lens may be removed. Lens barrel 620 may conform to the D-cut shape, thereby freeing a D-cut volume between carrier 630 and lens barrel 620. The AF module may preferably be integrated in the D-cut volume between carrier 630 and lens barrel 620. This may enable to limit an increase of diameter of the camera module due to the AF module and to limit a difference ΔD between a diameter of lens barrel 620 and a diameter of carrier 630 to be less than 0.05 mm, less than 0,5 mm, less than 1 mm, less than 2 mm, less than 3 mm or less than 6 mm.
Camera module 600 may also include an optical image stabilization system to provide stabilization capability. The OIS system may be configured to move sensor 660 in the sensor plane along the X and Y axes. The OIS system may additionally or alternatively be configured to move the sensor by rotating the sensor along a yaw, a pitch and/or a roll rotation axes, preferably along a yaw (Z) and pitch (X) rotation axes. In some embodiments, the OIS system may additionally or alternatively be provided by moving carrier 630 and lens barrel in the sensor plane along the X and Y axes using for example an OIS assembly according to the third aspect of the present disclosure.
Generally, camera module 600 may be configured to be waterproof. The camera module may include a protective seal configured to maintain impermeability of the camera module in the collapsed state and in the operative state as well as in intermediate states of camera module 600. Camera module 600 may also include an optical filter configured for filtering out a predetermined portion of the electromagnetic spectrum detectable by the image sensor. This may enable to filter non-visible radiations such as infrared radiations.
Generally, dimensions of camera module 600 may be in the following ranges: the camera module including the actuator may fit in a circle having a diameter between 6 and 50 mm. A diameter of the cover window may be between 5 and 40 mm. A height of the camera module in the inactive (collapsed) mode may be between 6 and 18 mm while in the active (pop-out) mode it may be between 7 and 30 mm. A variation of height between the inactive and active mode of the camera module may be between 1 and 15 mm.
Camera module 700 comprises a lens barrel 720, a carrier 730 configured to receive the lens barrel 720 and an image sensor 760. Camera module 700 may further comprise a retractable cover window (not shown) operated by a cover window pop-out assembly and actuator (not shown). Lens barrel 720 comprises an objective assembly. The objective assembly holds coaxially four lens elements 725a-725d defining an optical axis Z of camera module 700. Lens barrel 720 includes a lens element having two D-cuts. Lens barrel 720 conforms to the D-cut shape(s) hereby freeing a D-cut volume between carrier 730 and lens barrel 720.
Carrier 730 includes a carrier barrel for receiving lens barrel 720. Lens barrel 720 is positioned coaxially inwardly to carrier 730. Lens barrel 720 is coupled to carrier 730 to allow axial displacement of lens barrel 720 relative to the carrier 730. Lens barrel 720 and carrier 730 are axially coupled using two axial rails and corresponding two bearing balls enclosed therebetween in a way similar to that shown on
Camera module 700 further includes a pop-out assembly configured to controllably move lens barrel 720 from the collapsed state to the operative state. The pop-out assembly comprises a magnetic spring assembly 710 configured to bias lens barrel 720 in the operative state. Magnetic spring assembly 710 comprises at least one permanent magnet 770 fixed to the lens barrel 720 and a ferromagnetic yoke 780 fixed to carrier 730. Magnetic spring assembly 710 is configured to cause lens barrel 720 to axially move relative to carrier 730 from the collapsed state towards the operative state. Magnetic spring assembly 710 is positioned in an interstice between the carrier 730 and lens barrel 720. The at least one permanent magnet 770 is fixed to an outer wall of lens barrel 720. Yoke 780 is fixed to an inner wall of the carrier barrel.
Camera module 700 includes an AF module comprising at least one electrical coil fixed to an inner wall of the carrier barrel. The AF module is integrated in the D-cut volume freed between carrier 730 and lens barrel 720. The electrical coil is configured so that, when the lens barrel moves towards the operative state into an auto-focus range, a current in the at least one electrical coil is capable of inducing axial forces on at least one permanent magnet 770 to cause axial movement of the lens barrel and enable auto-focus capability of the camera module. The auto-focus range may refer to positions along the Z axis for which the electrical coil may induce forces capable of axially moving the lens barrel. Magnetic spring assembly 710 is configured to move lens barrel 720 within the auto-focus range. In some embodiments, the AF module may allow maintaining lens barrel 720 in the operative state. In some embodiments, the pop-out force of magnetic spring assembly 710 may allow maintaining lens barrel 720 in the operative state.
Generally, dimensions of camera module 700 may be in the following ranges: the camera module including the actuator may fit in a circle having a diameter between 6 and 50 mm. A diameter of the cover window may be between 5 and 40 mm. A height of the camera module in the inactive (collapsed) mode may be between 6 and 18 mm while in the active (pop-out) mode it may be between 7 and 30 mm. A variation of height between the inactive and active mode of the camera module may be between 1 and 15 mm.
OIS system 800 comprises a bottom OIS frame 840, an intermediate OIS frame 830 and a top OIS frame 820. These may be referred to henceforth simply as “frames”. The bottom, intermediate and top frames may generally be substantially flat structures extending substantially into an OIS plane. The OIS frames may have a plate shape. Each OIS frame may include a hollow central portion to allow light to impinge on the image sensor. OIS system 800 may be configured to be mounted over an image sensor (not shown) defining a horizontal plane. Bottom frame 840 may be configured to be fixedly coupled relative to the image sensor. Bottom frame 840 may be configured to be mounted on a PCB onto which the sensor may be mounted centered on the sensor and such that the OIS plane is parallel to the sensor plane. Intermediate frame 830 may be configured to be mounted on bottom frame 840. Intermediate frame 830 may be coupled to be axially displaceable relative to bottom frame 840 in a direction Y parallel to the horizontal sensor plane. Intermediate frame 830 may be coupled to bottom frame 840 to resist axial displacement in a direction X transverse to the Y direction and parallel to the sensor plane. For example, intermediate frame 830 may have (only) one degree of freedom according to the Y direction with respect to bottom frame 840. In some embodiments, bottom frame 840 and intermediate frame 830 may include one or more parallel rails in the Y direction to allow axial displacement/shifting of intermediate frame 830 relative to bottom frame 840. In some embodiments, the one or more parallel rails may enclose bearing balls to ensure low friction coupling between intermediate frame 830 and bottom frame 840. Top frame 820 may be configured to be mounted onto intermediate frame 830. Top frame 820 may be coupled to be axially displaceable relative to intermediate frame 830 in the X direction transverse to the direction Y and parallel to the sensor plane. Top frame 820 may be coupled to intermediate frame 830 to resist axial displacement in the Y direction transverse to the X direction. For example, top frame 820 may have (only) one degree of freedom according to the X direction with respect to intermediate frame 830. In some embodiments, top frame 820 and intermediate frame 830 may include one or more parallel rails in the X direction to allow axial displacement of top frame 820 relative to intermediate frame 820. In some embodiments, the one or more parallel rails may enclose bearing balls to ensure low friction coupling between intermediate frame 830 and top frame 820. Top frame 820 may be configured to fixedly support a carrier barrel 810 of a camera module. Carrier barrel 810 may be configured to receive a lens barrel. In some embodiments, carrier barrel 810 may be integral to top frame 820.
OIS system 800 may further comprise a VCM mechanism (or more generally a linear motion induction motor mechanism) configured for selectively displacing top frame 820 relative to the intermediate frame according to the X direction. The VCM mechanism may further be configured for selectively displacing intermediate frame 830 (and together with intermediate frame 830, top frame 820 carried thereon) relative to bottom frame 840 in the Y direction. In other words, the VCM mechanism may be configured for selectively displacing top frame 820 according to the X and/or Y axes. The VCM mechanism may include one VCM for OIS actuation along the X direction and another VCM for OIS actuation along the Y direction. OIS system 800 may include a first and second permanent magnets defining respectively a first and second magnetic axes. In some embodiments, the first and second permanent magnets may be fixed to top frame 820 so that the first and second magnetic axes are respectively colinear to the X and Y axes. In some embodiments, one permanent magnet may be fixed to top frame 820 so that its magnetic axis is parallel to the X axis and the other permanent magnet to intermediate frame 830 so that its magnetic axis is parallel to the Y axis. The first permanent magnet having its magnetic axis parallel to the X axis and the second permanent magnet having its magnetic axis parallel to the Y axis may respectively be referred to as X magnet and Y magnet. Further, OIS system 800 may include a first and second electrical coils configured to cooperate respectively with the first and second permanent magnets configured so that a current in the first electrical coil and/or second electrical coil is capable of inducing axial forces on the first permanent magnet and/or on the second permanent magnet thereby causing axial movement of the top frame in the X and/or Y directions. In some embodiments, OIS system 800 may further include additional sets of magnets and corresponding coils. OIS system 800 may further include a controller. OIS system 800 may further include a hall position sensor to allow feedback on the frames' positions. OIS system 800 may also include a yoke positioned in the sensor plane so that a magnetic force exerted by the X and Y magnets on the yoke keeps the layered structure together thereby keeping the bearing balls enclosed in the rails.
OIS system 800 may be integrated to a camera module according to the second aspect of the present disclosure. The carrier of the camera module may be fixedly coupled to top frame 820 of OIS system 800 so that a motion of the top frame is transmitted to the carrier. In some embodiments, the carrier may be integral to top frame 820.
External dimensions of OIS system 800 may be such that OIS system 800 may fit in a circle having a diameter between 6 and 50 mm.
Camera module 1000 may include a lens barrel 1020, a carrier 1030 configured to receive the lens barrel 1020 and an image sensor 1060. Camera module 1000 may further comprise a retractable cover window (not shown) operated by a cover window pop-out assembly and actuator (not shown). Lens barrel 1020 comprises an objective assembly. The objective assembly holds coaxially a plurality of lens elements defining an optical axis Z of camera module 1000. Lens barrel 1020 includes one lens element having at least one D-cut shape. Lens barrel 1020 conforms to the D-cut shape(s) hereby freeing a D-cut volume between the carrier 1030 and the lens barrel 1020.
Carrier 1030 includes a carrier barrel for receiving lens barrel 1020. Lens barrel 1020 is positioned coaxially inwardly to carrier 1030. Lens barrel 1020 is coupled to carrier 1030 to allow axial displacement of lens barrel 1020 relative to carrier 1030. Lens barrel 1020 and carrier 1030 are axially coupled using one or more (e.g. two) axial rails 1022a, 1022b and corresponding one or more (e.g. two) bearing balls enclosed therebetween. Carrier 1030 is mounted on OIS system 900 described with reference to
Lens barrel 1020 has an operative state and a collapsed state. In the operative state, image sensor 1060 is positioned in a focal plane or in an imaging plane of the objective assembly. In the collapsed state, the camera module may be disabled i.e. the camera module may be unable to image a field of view of the objective assembly. The operative state corresponds to a pop-out state of camera module 1000 in which a TTL of the camera module is higher than a TTL of the camera module in the collapsed state.
Camera module 1000 further includes a pop-out assembly configured to controllably move lens barrel 1020 from the collapsed state to the operative state. The pop-out assembly comprises a magnetic spring assembly configured to bias lens barrel 1020 in the operative state. The magnetic spring assembly comprises at least one permanent magnet 1070 fixed to lens barrel 1020, and a ferromagnetic yoke 1080 fixed to carrier 1030. The magnetic spring assembly is configured to cause lens barrel 1020 to axially move relative to carrier 1030 from the collapsed state towards the operative state. The magnetic spring assembly is positioned in an interstice between carrier 1030 and lens barrel 1020. The at least one (e.g. two) permanent magnet 1070 is fixed to an outer wall of lens barrel 1020. Yoke 1080 is fixed to an inner wall of carrier barrel 1030.
The retractable cover window (not shown) may also be configured to controllably move axially between a retracted position and an extended position. In the retracted position, the cover window may be positioned to abut on the most distal surface of the lens barrel in the collapsed state and to maintain the lens barrel in the collapsed state. In the extended position, the cover window may be positioned to provide for an axial gap with the lens barrel in the operative state. The motion of the cover window between the retracted and extended positions and the motion of the lens barrel between the collapsed and extended positions may be coordinated. The axial movement of the cover window may be driven by a cover window pop-out assembly operated by an actuator. The cover window pop-out assembly may be one of the mechanisms shown with reference to
In other words, the magnetic spring may linearly move the lens barrel in a direction parallel to the lens optical axis. This may switch the pop-out camera between the (operative) pop-out state and the (non-operative) collapsed state. In order to switch the pop-out camera between the collapsed state and the pop-out state, the cover window is linearly moved in the direction parallel to the lens optical axis simultaneously or before moving the lens barrel. The stroke of the lens barrel switching movement between the collapsed state and the pop-out state may be between 0.5 mm and 10 mm. This lens barrel switching movement may be performed in an open loop configuration as accuracy requirements are relatively low. In the pop-out state, the AF module may linearly move the lens barrel for performing auto-focus. The stroke of this auto-focus movement may be between 0.5 mm and 5 mm. The auto-focus movement may be performed in a closed loop configuration, as accuracy requirements are high for performing auto-focus.
It is noted that a lens OIS actuator generally requires additional space in the camera module in comparison to a sensor based OIS. An OIS system disclosed herein has a design which limits this issue. In particular, OIS system 900 may have a flat layered structure in which the mechanical parts enabling movement are positioned at a base of the camera module. A height of the flat layered structure may be below 3 mm and typically of about 2 mm or less. For comparison, a height of the camera module may be between 5 to 15 mm, typically 8 to 10 mm, for example about 9 mm. A presently disclosed OIS system may avoid increasing a diameter of a cover window of the camera module and enable a low shoulder design.
Generally, dimensions of camera module 1000 may be in the following ranges: the camera module including the actuator may fit in a circle having a diameter between 6 and 50 mm. A diameter of the cover window may be between 5 and 40 mm. The height of the camera module in the inactive (collapsed) mode may be between 6 and 18 mm while in the active (pop-out) mode it may be between 7 and 30 mm. A variation of height between the inactive and active mode of the camera module may be between 1 and 15 mm.
It is to be noted that the various features described in the various embodiments can be combined according to all possible technical combinations.
It is to be understood that the disclosure is not limited in its application to the details set forth in the description contained herein or illustrated in the drawings. The disclosure is capable of other embodiments and of being practiced and carried out in various ways. Hence, it is to be understood that the phraseology and terminology employed herein are for the purpose of description and should not be regarded as limiting. As such, those skilled in the art will appreciate that the conception upon which this disclosure is based can readily be utilized as a basis for designing other structures, methods, and systems for carrying out the several purposes of the presently disclosed subject matter.
Those skilled in the art will readily appreciate that various modifications and changes can be applied to the embodiments of the disclosure as hereinbefore described without departing from its scope, defined in and by the appended claims.
This is a 371 application from international patent application PCT/IB2022/052194 filed Mar. 11, 2022, which claims the benefit of priority from U.S. Provisional patent applications Nos. 63/159,660 filed Mar. 11, 2021, 63/230,972 filed Aug. 9, 2021, 63/276,072 filed Nov. 5, 2021, 63/280,244 filed Nov. 17, 2021, 63/280,732 filed Nov. 18, 2021, 63/285,144 filed Dec. 2, 2021, and 63/298,335 filed Jan. 11, 2022, all of which are incorporated herein by reference in their entirety.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/IB2022/052194 | 3/11/2022 | WO |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2022/190049 | 9/15/2022 | WO | A |
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